Design of Peak Detection Circuit for High Heavy Frequency Laser Terrestrial Footprint Detector
In this study,a two-stage peak detection circuit was designed to realize the peak detection and holding of a narrow pulse signal with a rising edge of 3 ns,pulse width of 5 ns,falling edge of 3 ns,and re-frequency of 10 kHz.The voltage-signal acquisition was accomplished using the analog-to-digital converter of an STM32 microcontroller.The basic structure of the ground detector with an APD as the photodetector is given in the block diagram,where the amplifier circuit module in the detector system is used to increase the width of the received laser pulse from 1 ns to 5 ns.The peak detection circuit module is used to detect and record the data of the narrow pulse.The signal source was used to complete a functional test of the peak detection circuit,and a laser with a heavy frequency of 1 kHz and pulse width of approximately 1 ns was used to test the whole detector system.The results verified that this system could better detect and record the peak of this laser signal.
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